Abaixo está uma instrução que descreve uma tarefa de geração de SQL, combinada com uma entrada que fornece mais contexto sobre os esquemas de tabela disponíveis. Escreva o código SQL que responda adequadamente à solicitação
 ###Instrução: Quando Louise, a princesa real, se casou?
 ###Tabelas: CREATE TABLE britain (britain_id AUTO_INCREMENT PRIMARY KEY, Name dates VARCHAR, Eldest daughter from (date) to (date) VARCHAR, Father VARCHAR, Date married VARCHAR, Husband dates VARCHAR) CREATE TABLE national_division (national_division_id AUTO_INCREMENT PRIMARY KEY, Institution VARCHAR, Location VARCHAR, Nickname VARCHAR, Enrollment INT, Established INT) CREATE TABLE european_tour_professional_career_summary (european_tour_professional_career_summary_id AUTO_INCREMENT PRIMARY KEY, Year INT, Starts INT, Cuts made INT, Wins INT, 2nd INT, 3rd INT, Top 10 INT, Top 25 INT, Earnings (€) INT, Money list rank INT) CREATE TABLE switchers_s_series (switchers_s_series_id AUTO_INCREMENT PRIMARY KEY, Model VARCHAR, Specification VARCHAR, Build date VARCHAR, Total produced INT, Wheel arrangement VARCHAR, Prime mover VARCHAR, Power output VARCHAR) CREATE TABLE grand_slam_women's_doubles_performance_timeline (grand_slam_women's_doubles_performance_timeline_id AUTO_INCREMENT PRIMARY KEY, Tournament VARCHAR, 2007 VARCHAR, 2010 VARCHAR, 2011 VARCHAR, 2012 VARCHAR, 2013 VARCHAR)  
SELECT Date married FROM britain WHERE Name dates = louise, princess royal